US CMS Silicon Tracker : Overview

J. Incandela

University of California Santa Barbara

US CMS Silicon Tracker Project Manager

Fermilab PMG

April 9, 2004

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 2

Squarks and Gluinos

•SUSY could be discovered in one good month of operation …

The figure shows the q, g mass reach for various luminosities in the inclusive ET + jets channel.

~ ~

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 3

Gluino reconstruction

M. Chiorboli

~

p

p

g~

b~

b

b

l

l

01

~

02

~ l~

Event final state:• 2 high pt isolated leptons OS• 2 high pt b jets• missing Et

~ bb g pp

b~02

01

~

(26 %)

(35 %)

(0.2 %)

llll 01

~ ~

(60 %)

ll

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 4

Tracking

• Efficient & robust• Fine granularity to resolve nearby tracks

• Fast response time to resolve bunch crossings

• Radiation resistant devices

• Reconstruct high PT tracks and jets• ~1-2% PT resolution at ~ 100 GeV

• Tag b jets• Asymptotic impact parameter d ~ 20 m

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 5

Silicon Strips

6 layers of 500 m sensorshigh resistivity, p-on-n

4 layers of 320 m sensorslow resistivity, p-on-n

Blue = double sided

Red = single sided

9+3 disks per end

Strip lengths range from Strip lengths range from 10 cm10 cm in the inner layers to in the inner layers to 20 cm20 cm in the outer layers. in the outer layers.

Strip pitches range from Strip pitches range from 8080mm in the inner layers to near in the inner layers to near 200200mm in the outer layers in the outer layers

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 6

Some Tracker Numbers

• 6,136 Thin wafers 320 μm• 19,632 Thick wafers 500 μm

• 6,136 Thin detectors (1 sensor)• 9,816 Thick detectors (2 sensors)

• 3112 + 1512 Thin modules (ss +ds)• 4776 + 2520 Thick modules (ss +ds)

• 10,016,768 individual strips and readout electronics channels

• 78,256 APV chips• ~26,000,000 Bonds

• 470 m2 of silicon wafers • 223 m2 of silicon sensors

• (thick = 175 m2 + thin= 48 m2)

FE hybrid FE hybrid with FE with FE ASICSASICS

Pitch adapterPitch adapter

Silicon sensorsSilicon sensors

CF frameCF frame

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 7

Our Responsibility

5.4 m

2.4

m

Outer Barrel (TOB)

~105 m2

NEW:End Caps (TEC)

50% Modules for Rings 5 and 6 and

hybrid processing for Rings 2,5,6

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 8

Efficiency, Purity, Resolution

ROD INTEGRATION

AachenKarlsruheStrasbourgZurichWien

PETALS INTEGRATION Aachen

Brussels Karlsruhe

Louvain

Lyon Strasbourg

BrusselsWien Lyon

TEC assemblyTEC assembly

CERN

Frames:

BrusselsSensors:factories

Hybrids:Strasbourg

Pitch adapter:Brussels

Hybrid:CF carrier

TK ASSEMBLYAt CERN

LouvainStrasbourg

Pisa Perugia Wien

BariPerugia

Bari FirenzeTorinoPisaPadova

TIB-TID INTEGRATION

FNAL

UCSB

TOB assembly TIB-ID assemblyAt CERN Pisa Aachen Karlsruhe. --> Lyon

Karlsruhe

Pisa

Sensor QAC

Moduleassembly

Bonding &testing

Sub-assemblies

FNAL

US in the tracker

Integrationinto mechanics

KSU

US carries roughly half of the total production load

FNAL UCSB

UCSB

UCSB

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 10

Outer Barrel Production

• Outer Barrel • Modules

• 4128 Axial (Installed)

• 1080 Stereo (“ “)

• Rods

• 508 Single-sided (“ “)

• 180 Double-sided (“ “)

• US Tasks • All hybrid bonding & test

• All Module assembly & test

• All Rod assembly & test

• Joint Responsibilities with CERN• Installation & Commissioning

• Maintenance and Operation

~20 cm

Modules Built & Tested in US

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 11

Rods & Wheels

0.9 m1.2 m

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 12

End Cap Construction

• Central European Consortium requested US help

• With consent of US CMS and DOE, we agreed to produce up to 2000 R5 and R6 modules

• After 10 weeks UCSB successfully built the R6 module seen above.

• We’re nearly ready to go on R5

First TEC Module Built at UCSB

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 13

The Group• Fermilab (FNAL)

• M. Demarteau, A. Ronzhin, K. Sogut, L. Spiegel, S. Tkaczyk + technicians

• Kansas State University (KSU)• T.Bolton, W.Kahl, R.Sidwell, N.Stanton

• University of California, Riverside (UCR)• Gail Hanson, Gabriella Pasztor, Patrick Gartung

• University of California, Santa Barbara (UCSB)• A. Affolder, S. Burke, C.Campagnari, D. Hale, (C. Hill), J.Incandela, S.

Kyre, J. Lamb, S. Stromberg, (D. Stuart), R. Taylor, D. White + techs.• University of Illinois, Chicago (UIC)

• E. Chabalina, C. Gerber, T. Ten• University of Kansas (KU)

• P. Baringer, A. Bean, L. Christofek, X. Zhao • University of Rochester (UR)

• R.Demina, R. Eusebi, E. Halkiadakis, A. Hocker, S.Korjenevski, P. Tipton• Mexico:3 institutes led by Cinvestav Cuidad de Mexico• Brown is also planning to join

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 14

Recap of this past year

• Problems continued to plague components• US contributions have been critical

• US played major role in finding and fixing a series of flaws• In some cases these problems would have been fatal

• Problems for module components have been addressed (see talks by R. Demina and E.Chabalina)

• Frames and hybrids: Yield and rates are high and rising• Sensors and US involvement

• US identified CM Noise problem with STM sensors• Advocated shifting order to HPK:

• Provided funds for procuring the masks• Insisted order be placed with HPK by end of February –

beyond which we would have delayed HPK deliveries• CMS is Re-qualifying STM now

• Either STM quality reaches HPK standards or remainder of order will be shifted to HPK

• Upshot: no matter what, we achieve very high delivery rates by July

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 15

Adapting to Delays

• But these issues have meant that the schedule has slipped again!• We have lost 6-8 months in FY04 due to this last round of problems

• In parallel with our work to resolve component problems• We underwent a major upgrade of the US production lines in order to

achieve significantly higher production capacity to allow us to recover lost schedule time.

• New and better methods

• More and better tooling and hardware

• Better software and Quality Control

• Both FNAL and UCSB production lines have demonstrated more than 100% increases in stable, high quality module production

• Our production capacity is unprecedented:• CDF Run 2 silicon detector = 750k channels:

• We can produce this many channels in 10 weeks without overtime or extended working weeks.

With overtime we could do this in 6 weeks

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 16

Productivity Enhancements(see talks by White and Spiegel)

• Gantry (robotic) module assembly• Redesigned: more robust, flexible,

easily maintained

• Surveying and QA• Automated use of independent

system (OGP)

• More efficient, accurate, fail-safe

•Module Wirebonding• Fully automated wirebonding

• Faster and more reliable bonding

• Negligible damage or rework

•Taken together:• Major increase in US capabilities

• Higher quality

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 17

Testing & QA (see talk by E. Chabalina)

• US has led in many respects • US testing macros and test stand

configurations now used everywhere

• Critical contributions• Discovered and played lead role in

solution of potentially fatal problems!

• Defective hybrid cables

• Vibration damage to module wirebonds

• Common Mode Noise problem - traced it to ST sensors

• Other Important contributions;

• Problem of Faulty pipeline cells

• Led to improved screening

•Taken together• Averted a disaster

• Resulted in higher quality

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 18

Rod Assembly, Test, Transport(See talks by P. Tipton and J. Lamb)

• US contributions• Designed and built module

installation tools

• Built single rod test stands

• Designed and built and multi-rod burn-in stands

• Will lead in the definition of tests and test methods

• Transportation boxes

• Production• Will build and test ~350 rods

(+10% spares) at each site

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 19

Summary

• CMS is designed to maximize LHC physics• The tracker is one of the main strengths of CMS

• US is making critical contributions• We have (unfortunately) proven to be far more essential to the

success of the CMS tracker project than anticipated

• We have uncovered serious problems• Huge US effort to help find good solutions as quickly as possible.

• Module component problems have been solved

• Sensor issue is dynamic but we have a solution

• We’ve accumulated more delays!

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 20

Upshot

• Schedule has slipped and the project has evolved:• Increased US capacity from 15 modules per day to > 30

• Complete all deliverable modules before the end of FY05

• Delivery of parts crucial

• Rod assembly to keep pace with module assembly

• Final assembly of the wheels at CERN slipping into FY06.

• The costs of an unexpectedly prolonged module and rod production period are being partially offset by use of funds originally allocated for I&C in FY04-05

• Parts are the issue

UCSB CMS Silicon Tracker PMG April 9, 2004, J. Incandela - Overview 21

Schedule of Presentations

1:00 pm Project Overview J. Incandela (UCSB)1:15 pm Fermilab Production Line L. Spiegel (FNAL) 1:35 pm UCSB Production Line D. White (UCSB) video1:55 pm Results from Module Testing E. Chabalina (UIC)2:20 pm Module Components R. Demina (U. Rochester)2:50 pm Coffee Break 3:00 pm Rods J. Lamb (UCSB) video3:20 pm Long-term testing and transportation of rods

P. Tipton (U. Rochester) video3:40 pm Schedule J. Incandela (UCSB)4:00 pm Executive Session E. Temple4:40 pm Closeout5:00 pm Adjourn